Polarization-Insensitive Preparation of High-Nuclear-Spin Ionic Qubits
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Solution Overview
Problem
Conventional state preparation techniques struggle to initialize high nuclear spin ions into a selected ground manifold state due to Zeeman splitting, making them unsuitable for use as qubits in quantum computers.
Innovation Solution
Applying first manipulation signals to couple non-selected ground manifold states to pumped manifolds while suppressing transitions from selected states, followed by second manipulation signals to flush out pumped manifolds, thereby increasing the probability of the ions being in the selected ground manifold state to 100%, using specific frequency and polarization configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional state preparation techniques are used on high nuclear spin ions, then the ions have non-zero nuclear spin leading to Zeeman splitting of the ground state into multiple states, but the ions cannot be properly initialized into the qubit space
Solution Approach 1:
The patent segments the ground state manifold into selected states (for qubit space) and non-selected states (to be pumped out). By applying manipulation signals with specific frequencies and polarizations, the system selectively couples non-selected states to pumped manifolds while leaving selected states isolated, enabling reliable qubit initialization despite Zeeman splitting
Solution Approach 2:
The patent changes the parameters of manipulation signals (frequency, polarization) to achieve selective coupling. By tuning the frequency to match transitions from non-selected ground manifold states to pumped manifolds, and using specific polarization configurations, the system pumps out unwanted states while preserving selected qubit states
2Reliability
If manipulation signals are applied to pump out non-selected ground manifold states, then the selected ground manifold states can be isolated, but the process requires specific frequency and polarization configurations increasing operational complexity
Solution Approach 1:
The patent employs a feedback mechanism where the controller adjusts manipulation signal parameters based on the atomic object's response. The system monitors the pumping process and tunes frequencies and polarizations to optimize the isolation of selected ground manifold states, making the complex configuration process manageable through automated control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively initializes high nuclear spin ions into a selected ground manifold state, enabling their reliable use as qubits in quantum computers.
Implementation Method 1
Some of these ions, however, have a non-zero nuclear spin. The non-zero nuclear spin leads to Zeeman splitting of the ground state into a number of states.
Data Source
AI summary
Embodiments relate to initializing and/or performing state preparation for an atomic object. The controller controls first manipulation sources to provide first manipulation signals and second manipulation sources to provide second manipulation signals. The first and second manipulation signals are incident on the atomic object. The atomic object has a nuclear spin greater than one half. A ground state manifold of the atomic object comprises one or more selected ground manifold states and non-selected ground manifold states. The first manipulation signals are configured to drive transitions from the non-selected ground manifold states to one or more pumped manifolds of the atomic object and suppress transitions out of the selected ground manifold states. The second manipulation signals are configured to stimulate the atomic object to decay a pumped manifold into a decayed state, wherein there is a non-zero probability that the decayed state is one of the selected ground manifold states.